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Two series of the title compounds were prepared by reaction of 1,2-bis(4-amino-5-mercapto- 4H-1,2,4-triazol-3-yl)ethane with N-aryl-2-oxopropane-hydrazonoyl chlorides. The spectral data of such compounds indicated that they exist predominantly in the bis-hydrazone tautomeric form.

Synthesis and Tautomeric Structure of 1,2-Bis-(7-arylhydrazono-7H-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazin-3-yl)ethanes